Improvement in gutter-head for mouldings



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JOHN WHITWORTH, OF OLEVELANDQOHIO, ASSIGNOR -TO HIMSELF AND W.H.'HAWKINS, OF SAME PLACE.'

Letters Patent No. 71,670, dated December 3, 1867.

tite Stigehnle maar tu in time ette'rs minut :mt mating wat nf tigesame.

To ALL WHOM 1T MAY coNoERN: Y.

Be it known that I, JOHN WHITWORCEII, of Cleveland, in the county of.Onyahogaand State of Ohio, have invented certain new and usefulImprovements in Cutter-Head for Mouldings; and I do hereby declare thatthe following is a full and complete description ofthe same, referencebeing had to the accompanying drawings, making a part of thisspecication, in which- Figure lis a view of the under side of thecutter.

Figure 2 is a view of the edge,

Figure 3, a view showing the position of the cutter in relation to itsWork.

Figures 4, 5, 6, and 7 represent acutter of different form.

Likeletters of reference refer to like parts in the different views.

Fig. 1 represents a chilled cast-iron cutter, for cutting beads,mouldings, 3&0., for picture-frames,ornamental work, or for any likepurposes for which mouldings are ordinarily used, and which may be ofany size and style required. Cutters in common use for this purpose aremade of steel, nished up and tempered with great skill and care, inorder to obtain a fine and durable cutting-edge. Notwithstanding thecare and skill exercised, the cutters very soon become dull, making thework rough, and more especially so when the timber is hard, curled, orknotty. The time and labor necessarily spent in repairing and fittingthose worn cutters render 'them not only expensive, but, in consequenceof their being so frequently sharpened, the work becomes irregular insize, and the mouldings -not comparable, and variable in shape. In orderto avoid this ditliculty, labor,'and expense, the cutter is made ofchilled cast \iron, which experience has shown can be wrought to a inecutting-edge, lasting very much longer than steel, and considerably lessexpensive. Steel cutters require dressing every few hours, while thechilled cutters not more than once in tive or six days. i

The manner of making vthese cutters 'is by simply forming a pattern ofthe size and style of mouldin required, and casting them 'in chills,which are then ground on stones, and emery-whcels constructed for thevpurpose. The vchills are so constructed that the bias of thecutting-edge falls back from theedge, thereby throwing the chips o' fromthe work or timber to one side, as it'passes along under the cutter,instead of down upon it, as do the cutters now in ordinary use. Fig. 3shows the position of the cutter while in use, A being the cutter, and Bthe moulding or timber. t

These cutters are sharpened by dressing or grinding the bias or angle ofthe cutting-edge C, thus leaving the curves of the mould unchanged;hence, as the cutting-,edge may back, it still retains its first sizeand form.

Fig. 5 shows the cutter with the angle ot" the receding from thecutting-edge, which is preferred, and will therefore throw the chips inthe direction of the dotted line a, whereas the bias of theangle of thecutter A, iig. I, is the reverse, and hence will throw the chips fromthe opposite side from that of g. 5, and-of which figure iig. 4 i-s aside view. y

What I claim as my improvement, and desire to secure by Letters Patent,is

The herein-described chilled cast-iron cutter, .made in the manner asand for the-purpose substantially set forth, as a new article ofmanufacture.

JOHN WHITWORTH. Witnesses:

W. H. BRRIDGE,

FRANK S. ALBEN.

